Tresor (German for safe or vault) is an underground techno nightclub and record label. The club was founded in March 1991 in the vaults of the former old Wertheim department store in Mitte, the central part of the former East Berlin, next to the famous Potsdamer Platz, however the history of the club goes back to 1988 when the electronic music label Interfisch opened the Ufo Club in Berlin.